US20130192623A1 - Electronic cigarette - Google Patents

Electronic cigarette Download PDF

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Publication number
US20130192623A1
US20130192623A1 US13/756,127 US201313756127A US2013192623A1 US 20130192623 A1 US20130192623 A1 US 20130192623A1 US 201313756127 A US201313756127 A US 201313756127A US 2013192623 A1 US2013192623 A1 US 2013192623A1
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United States
Prior art keywords
heater
electronic cigarette
diverter
air flow
operable
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US13/756,127
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US9510623B2 (en
Inventor
Christopher S. Tucker
Geoffrey Brandon Jordan
Barry S. Smith
Ali A. Rostami
Charles E.B. Glenn, SR.
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Altria Client Services LLC
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Altria Client Services LLC
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Family has litigation
Priority to US201261593004P priority Critical
Application filed by Altria Client Services LLC filed Critical Altria Client Services LLC
Priority to US13/756,127 priority patent/US9510623B2/en
Publication of US20130192623A1 publication Critical patent/US20130192623A1/en
Assigned to Altria Client Services Inc. reassignment Altria Client Services Inc. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GLENN, CHARLES E.B., SR, ROSTAMI, ALI A., SMITH, BARRY S., JORDAN, Geoffrey Brandon, TUCKER, CHRISTOPHER S.
Assigned to ALTRIA CLIENT SERVICES LLC reassignment ALTRIA CLIENT SERVICES LLC MERGER AND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: Altria Client Services Inc., ALTRIA CLIENT SERVICES LLC
Publication of US9510623B2 publication Critical patent/US9510623B2/en
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    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24FSMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F7/00Mouthpieces for pipes; Mouthpieces for cigar or cigarette holders
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24FSMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00Smokers' requisites not otherwise provided for
    • A24F47/002Simulated smoking devices, e.g. imitation cigarettes
    • A24F47/004Simulated smoking devices, e.g. imitation cigarettes with heating means, e.g. carbon fuel
    • A24F47/008Simulated smoking devices, e.g. imitation cigarettes with heating means, e.g. carbon fuel with electrical heating means
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24FSMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00Smokers' requisites not otherwise provided for
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24FSMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00Smokers' requisites not otherwise provided for
    • A24F47/002Simulated smoking devices, e.g. imitation cigarettes
    • A24F47/004Simulated smoking devices, e.g. imitation cigarettes with heating means, e.g. carbon fuel
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00Sprayers or atomisers specially adapted for therapeutic purposes
    • A61M11/001Particle size control
    • A61M11/003Particle size control by passing the aerosol trough sieves or filters
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00Sprayers or atomisers specially adapted for therapeutic purposes
    • A61M11/04Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised
    • A61M11/041Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised using heaters
    • A61M11/042Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised using heaters electrical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00Inhalators
    • A61M15/06Inhaling appliances shaped like cigars, cigarettes or pipes
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01CRESISTORS
    • H01C17/00Apparatus or processes specially adapted for manufacturing resistors
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B1/00Details of electric heating devices
    • H05B1/02Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227Applications
    • H05B1/023Industrial applications
    • H05B1/0244Heating of fluids
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B3/00Ohmic-resistance heating
    • H05B3/0014Devices wherein the heating current flows through particular resistances
    • H05B3/026
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B3/00Ohmic-resistance heating
    • H05B3/10Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B3/00Ohmic-resistance heating
    • H05B3/10Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B3/00Ohmic-resistance heating
    • H05B3/10Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B3/00Ohmic-resistance heating
    • H05B3/40Heating elements having the shape of rods or tubes
    • H05B3/42Heating elements having the shape of rods or tubes non-flexible
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B3/00Ohmic-resistance heating
    • H05B3/40Heating elements having the shape of rods or tubes
    • H05B3/42Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24FSMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00Smokers' requisites not otherwise provided for
    • A24F47/002Simulated smoking devices, e.g. imitation cigarettes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00Sprayers or atomisers specially adapted for therapeutic purposes
    • A61M11/001Particle size control
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00Sprayers or atomisers specially adapted for therapeutic purposes
    • A61M11/04Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00Inhalators
    • A61M15/0001Details of inhalators; Constructional features thereof
    • A61M15/002Details of inhalators; Constructional features thereof with air flow regulating means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/0015Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors
    • A61M2016/0018Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors electrical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M21/00Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
    • A61M2021/0005Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus
    • A61M2021/0016Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus by the smell sense
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/36General characteristics of the apparatus related to heating or cooling
    • A61M2205/3653General characteristics of the apparatus related to heating or cooling by Joule effect, i.e. electric resistance
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/82Internal energy supply devices
    • A61M2205/8206Internal energy supply devices battery-operated
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/82Internal energy supply devices
    • A61M2205/8268Fuel storage cells
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2209/00Ancillary equipment
    • A61M2209/02Equipment for testing the apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00Control; Monitoring or safety arrangements
    • F04C2270/04Force
    • F04C2270/042Force radial
    • F04C2270/0421Controlled or regulated
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B2203/00Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021Heaters specially adapted for heating liquids
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49082Resistor making
    • Y10T29/49083Heater type

Abstract

An electronic cigarette includes a liquid supply including liquid material, a heater operable to heat the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol, a wick in communication with the liquid material and in communication with the heater such that the wick delivers the liquid material to the heater, at least one air inlet operable to deliver air to a central air passage upstream of the heater, and a mouth end insert having at least two diverging outlets. The electronic cigarette can also include an air flow diverter which directs incoming air away from a heating zone of the heater.

Description

    CROSS REFERENCE TO RELATED APPLICATION
  • This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application No. 61/593,004, filed on Jan. 31, 2012, the entire content of which is incorporated herein by reference thereto.
  • SUMMARY OF SELECTED FEATURES
  • An electronic cigarette includes a heater which vaporizes liquid material to produce an aerosol and an airflow diverter for abating the tendency of incoming air to reduce heater performance and aerosol output due to its cooling effect upon the heater during a puff. The electronic cigarette can also include a mouth end insert including at least two diverging outlets.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a cross-sectional view of an electronic cigarette according to a first embodiment wherein the mouth end insert includes diverging outlets.
  • FIG. 2 is a perspective view of a mouth end insert for use with the electronic cigarette of FIG. 1.
  • FIG. 3 is a cross-sectional view along line B-B of the mouth end insert of FIG. 2.
  • FIG. 4 is a cross-sectional view of an embodiment wherein an electronic cigarette includes an air flow diverter.
  • FIG. 5 is an enlarged view of the air flow diverter of the electronic cigarette of FIG. 4.
  • FIG. 6 is a cross-sectional view of an embodiment wherein an electronic cigarette includes an air flow diverter.
  • FIG. 7 is a cross-sectional view along line A-A of the electronic cigarette of FIG. 6.
  • FIG. 8 is a cross-sectional view of an embodiment wherein an electronic cigarette includes an air flow diverter.
  • FIG. 9 is a cross-sectional view of an electronic cigarette according to the first embodiment and further including a sleeve assembly.
  • FIG. 10 is a top view of an electronic cigarette including an aroma strip on an outer surface thereof.
  • FIG. 11 is a cross-sectional view of a second embodiment of a mouth end insert for use with the electronic cigarettes of FIGS. 1, 4, 6 and 8.
  • FIG. 12 is an exploded view of the mouth end insert of FIG. 11.
  • FIG. 13 is a cross-sectional view of an embodiment wherein an electronic cigarette includes an air flow diverter.
  • FIG. 14 is a cross-sectional view along line A′-A′ of the electronic cigarette of FIG. 13.
  • FIG. 15 is a cross-sectional view of an embodiment wherein an electronic cigarette includes an air flow diverter.
  • FIG. 16 is an enlarged view of an air flow diverter and tank reservoir of the electronic cigarette of FIG. 15.
  • FIG. 17 is an enlarged view of an alternate air flow diverter and tank reservoir of the electronic cigarette of FIG. 15.
  • FIG. 18 is a cross-sectional view of an embodiment wherein an electronic cigarette includes an air flow diverter.
  • FIG. 19 is an enlarged view of an air flow diverter and tank reservoir of the electronic cigarette of FIG. 18.
  • FIG. 20 is enlarged views of an alternate air flow diverter and tank reservoir of the electronic cigarette of FIG. 18.
  • FIG. 21 is a cross-sectional view of an embodiment wherein an electronic cigarette includes a tank reservoir, two heaters and two air flow diverters.
  • FIG. 22 is an enlarged perspective view of the tank reservoir, the two air flow diverters and heaters of the electronic cigarette of FIG. 21.
  • FIG. 23 is a cross-sectional representation of an embodiment wherein electrical connections to the heaters are internal of the tank reservoir.
  • FIG. 24 is a cross-sectional top view of an embodiment wherein an electronic cigarette includes a tank reservoir and an air flow diverter disposed about a longitudinally extending wick.
  • FIG. 25 is a side view of the tank reservoir, the longitudinally extending wick and the air flow diverter of the electronic cigarette of FIG. 24.
  • FIG. 26 is a side view of an alternate tank reservoir having more than one liquid compartment, each with its own wick, heater and air flow diverter.
  • FIG. 27 is a perspective view of another alternate tank reservoir having more than one liquid compartment, each with its own wick, heater and the air flow diverter.
  • DETAILED DESCRIPTION
  • An electronic cigarette provides improved aerosol output and/or better mouthfeel by utilizing one or more of a mouth end insert including at least two off-axis, preferably diverging outlets, at least one air flow diverter and/or alternative materials for the construction of the electronic cigarette.
  • Not wishing to be bound by theory, the use of a mouth end insert having at least two off-axis, preferably diverging outlets allows for greater distribution of aerosol into a smoker's mouth so as to provide a fuller mouth feel. The mouth end insert also provides an impaction surface for collecting unaerosolized liquid droplets which prevents such liquid droplets from exiting the mouth end insert in a non-aerosolized form. The impaction surface of the mouth end insert also acts to intensify heat due to droplets striking the surface during smoking.
  • Moreover, while not wishing to be bound by theory, the use of an air flow diverter acts to slow the air flow and/or redirect at least some air flow around portions of the heater so as to abate the tendency of drawn airflow to cool the heater during increased draw on the electronic cigarette. It is believed that by reducing the cooling effect on the heater, it will provide greater aerosol output during longer and/or stronger draws on an electronic cigarette, as expected by the smoker.
  • As shown in FIGS. 1, 4, 6, 8, 9 and 13, a novel electronic cigarette 60 comprises a replaceable cartridge (or first section) 70 and a reusable fixture (or second section) 72, which are coupled together at a threaded connection 205 or by other convenience such as a snug-fit, detent, clamp and/or clasp. The first section 70 includes an outer tube 6 (or casing) extending in a longitudinal direction and an inner tube 62 coaxially positioned within the outer tube or casing 6. The second section 72 can also include an outer tube 6 (or casing) extending in a longitudinal direction. In an alternative embodiment, the outer tube 6 can be a single tube housing both the first section 70 and the second section 72 and the entire electronic cigarette 60 can be disposable.
  • In an embodiment, the electronic cigarette 60 can also include a central air passage 20 in an upstream seal 15. The central air passage 20 opens to the inner tube 62. Moreover, the electronic cigarette 60 includes a liquid supply reservoir 22. The liquid supply comprises a liquid material and optionally a liquid storage medium 21 operable to store the liquid material therein. In an embodiment, the liquid supply reservoir 22 is contained in an outer annulus between the outer tube 6 and the inner tube 62. The annulus is sealed at an upstream end by the seal 15 and by a liquid stopper 10 at a downstream end so as to prevent leakage of the liquid material from the liquid supply reservoir 22.
  • In an embodiment, a heater 14 is also contained in the inner tube 62 downstream of and in spaced apart relation to the central air passage 20. The heater 14 can be in the form of a wire coil, a planar body, a ceramic body, a single wire, a cage of resistive wire or any other suitable form. A wick 28 is in communication with the liquid material in the liquid supply reservoir 22 and in communication with the heater 14 such that the wick 28 disposes liquid material in proximate relation to the heater 14. The wick 28 may be constructed of a fibrous and flexible material. The wick 28 preferably comprises at least one filament having a capacity to draw a liquid, more preferably the wick 28 comprises a bundle of filaments which may comprise glass (or ceramic) filaments and most preferably a bundle comprising a group of windings of glass filaments, preferably three of such windings, all which arrangements are capable of drawing liquid via capillary action via interstitial spacings between the filaments. A power supply 1 in the second section 72 is operable to apply voltage across the heater 14. The electronic cigarette 60 also includes at least one air inlet 44 operable to deliver air to the central air passage 20 and/or other portions of the inner tube 62.
  • The electronic cigarette 60 further includes a mouth end insert 8 having at least two off-axis, preferably diverging outlets 24. The mouth end insert 8 is in fluid communication with the central air passage 20 via the interior of inner tube 62 and a central passage 63, which extends through the stopper 10. Moreover, as shown in FIGS. 7 and 8, the heater 14 preferably extends in a direction transverse to the longitudinal direction and heats the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol. In other embodiments, other orientations of the heater 14 are contemplated. For example, as shown in FIG. 13, the heater 14 and the heated portion of the wick 28 can be arranged longitudinally within the inner tube 62. Preferably, as shown, the heater 14 is arranged centrally within the inner tube 62. However, in other embodiments the heater 14 can be arranged adjacent an inner surface of the inner tube 62.
  • Referring now to FIG. 1, the wick 28, liquid supply reservoir 22 and mouth end insert 8 are contained in the cartridge 70 and the power supply 1 is contained in the second section 72. In one embodiment, the first section (the cartridge) 70 is disposable and the second section (the fixture) 72 is reusable. The sections 70, 72 can be attached by a threaded connection 205 whereby the downstream section 70 can be replaced when the liquid supply reservoir 22 is used up. Having a separate first section 70 and second section 72 provides a number of advantages. First, if the first section 70 contains the at least one heater 14, the liquid supply reservoir 22 and the wick 14, all elements which are potentially in contact with the liquid are disposed of when the first section 70 is replaced. Thus, there will be no cross-contamination between different mouth end inserts 8, for example, when using different liquid materials. Also, if the first section 70 is replaced at suitable intervals, there is little chance of the heater becoming clogged with liquid. Optionally, the first section 70 and the second section 72 are arranged to releaseably lock together when engaged.
  • In one embodiment, as shown in FIG. 10, the outer tube 6 can include a clear (transparent) window 71 formed of a transparent material so as to allow a smoker to see the amount of liquid material remaining in the liquid supply reservoir 22. The clear window 71 can extend at least a portion of the length of the first section 70 and can extend fully or partially about the circumference of the first section 70. In another embodiment, the outer tube 6 can be at least partially formed of a transparent material so as to allow a smoker to see the amount of liquid material remaining in the liquid supply reservoir 22.
  • In an embodiment, the at least one air inlet 44 includes one or two air inlets 44, 44′. Alternatively, there may be three, four, five or more air inlets. Preferably, if there is more than one air inlet 44, 44′, the air inlets 44, 44′ are located at different locations along the electronic cigarette 60. For example, as shown in FIG. 1, an air inlet 44 a can be positioned at the upstream end of the cigarette adjacent the puff sensor 16 such that the puff sensor supplies power to the heater upon sensing a puff by the smoker. Air inlet 44 a should communicate with the mouth end insert 8 so that a draw upon the mouth end insert activates the puff sensor. The air from the air inlet 44 a can then flow along the battery and to the central air passage 20 in the seal 15 and/or to other portions of the inner tube 62 and/or outer tube 6. At least one additional air inlet 44, 44′ can be located adjacent and upstream of the seal 15 or at any other desirable location. Altering the size and number of air inlets 44, 44′ can also aid in establishing the resistance to draw of the electronic cigarette 60.
  • In an embodiment, the heater 14 is arranged to communicate with the wick 28 and to heat the liquid material contained in the wick 28 to a temperature sufficient to vaporize the liquid material and form an aerosol.
  • The heater 14 is preferably a wire coil surrounding wick 28. Examples of suitable electrically resistive materials include titanium, zirconium, tantalum and metals from the platinum group. Examples of suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminium- titanium- zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese- and iron-containing alloys, and super-alloys based on nickel, iron, cobalt, stainless steel. For example, the heater can be formed of nickel aluminides, a material with a layer of alumina on the surface, iron aluminides and other composite materials, the electrically resistive material may optionally be embedded in, encapsulated or coated with an insulating material or vice-versa, depending on the kinetics of energy transfer and the external physicochemical properties required. Preferably, the heater 14 comprises at least one material selected from the group consisting of stainless steel, copper, copper alloys, nickel-chromium alloys, superalloys and combinations thereof. In an embodiment, the heater 14 is formed of nickel-chromium alloys or iron-chromium alloys. In one embodiment, the heater 14 can be a ceramic heater having an electrically resistive layer on an outside surface thereof.
  • In another embodiment, the heater 14 may be constructed of an iron-aluminide (e.g., FeAl or Fe3Al), such as those described in commonly owned U.S. Pat. No. 5,595,706 to Sikka et al. filed Dec. 29, 1994, or nickel aluminides (e.g., Ni3Al). Use of iron-aluminides is particularly advantageous in that they exhibit high resistivity. FeAl exhibits a resistivity of approximately 180 micro-ohms, whereas stainless steel exhibits approximately 50 to 91 micro-ohms. The higher resistivity lowers current draw or load on the power source (battery) 1.
  • In one embodiment, the heater 14 comprises a wire coil which at least partially surrounds the wick 28. In that embodiment, preferably the wire is a metal wire and/or the heater coil that extends partially along the length of the wick 28. The heater coil may extend fully or partially around the circumference of the wick 28. In another embodiment, the heater coil is not in contact with the wick 28.
  • Preferably, the heater 14 heats liquid in the wick 28 by thermal conduction. Alternatively, heat from the heater 14 may be conducted to the liquid by means of a heat conductive element or the heater 14 may transfer heat to the incoming ambient air that is drawn through the electronic cigarette 60 during use, which in turn heats the liquid by convection.
  • In one embodiment, the wick comprises a ceramic material or ceramic fibers. As noted above, the wick 28 is at least partially surrounded by the heater 14. Moreover, in an embodiment, the wick 28 extends through opposed openings in the inner tube 62 such that end portions 29, 31 of the wick 28 are in contact with the liquid supply reservoir 22.
  • Preferably, the wick 28 may comprise a plurality or bundle of filaments. The filaments may be generally aligned in a direction transverse to the longitudinal direction of the electronic cigarette. In one embodiment, the structure of the wick 28 is formed of ceramic filaments capable of drawing liquid via capillary action via interstitial spacings between the filaments to the heater 14. The wick 28 can include filaments having a cross-section which is generally cross-shaped, clover-shaped, Y-shaped or in any other suitable shape.
  • Preferably, the wick 28 includes any suitable material or combination of materials. Examples of suitable materials are glass filaments and ceramic or graphite based materials. Moreover, the wick 28 may have any suitable capillarity accommodate aerosol generating liquids having different liquid physical properties such as density, viscosity, surface tension and vapor pressure. The capillary properties of the wick 28, combined with the properties of the liquid, ensure that the wick 28 is always wet in the area of the heater 14 to avoid overheating of the heater 14.
  • Instead of using a wick, the heater can be a porous material of sufficient capillarity and which incorporates a resistance heater formed of a material having a high electrical resistance capable of generating heat quickly.
  • In one embodiment, the wick 28 and the fibrous medium 21 of the liquid supply reservoir 22 are constructed from an alumina ceramic. In another embodiment, the wick 28 includes glass fibers and the fibrous medium 21 includes a cellulosic material or polyethylene terephthalate.
  • In an embodiment, the power supply 1 includes a battery arranged in the electronic cigarette 60 such that the anode is downstream of the cathode. A battery anode connector 4 contacts the downstream end of the battery. The heater 14 is connected to the battery by two spaced apart electrical leads 26 (shown in FIGS. 4, 6 and 8).
  • Preferably, the connection between the uncoiled, end portions 27, 27′ (see FIG. 5) of the heater 14 and the electrical leads 26 are highly conductive and temperature resistant while the heater 14 is highly resistive so that heat generation occurs primarily along the heater 14 and not at the contacts.
  • The battery can be a Lithium-ion battery or one of its variants, for example a Lithium-ion polymer battery. Alternatively, the battery may be a Nickel-metal hydride battery, a Nickel cadmium battery, a Lithium-manganese battery, a Lithium-cobalt battery or a fuel cell. In that case, preferably, the electronic cigarette 60 is usable by a smoker until the energy in the power supply is depleted. Alternatively, the power supply 1 may be rechargeable and include circuitry allowing the battery to be chargeable by an external charging device. In that case, preferably the circuitry, when charged, provides power for a pre-determined number of puffs, after which the circuitry must be re-connected to an external charging device.
  • Preferably, the electronic cigarette 60 also includes control circuitry including a puff sensor 16. The puff sensor 16 is operable to sense an air pressure drop and initiate application of voltage from the power supply 1 to the heater 14. The control circuitry can also include a heater activation light 48 operable to glow when the heater 14 is activated. Preferably, the heater activation light 48 comprises an LED 48 and is at an upstream end of the electronic cigarette 60 so that the heater activation light 48 takes on the appearance of a burning coal during a puff. Moreover, the heater activation light 48 can be arranged to be visible to the smoker. In addition, the heater activation light 48 can be utilized for cigarette system diagnostics. The light 48 can also be configured such that the smoker can activate and/or deactivate the light 48 for privacy, such that the light 48 would not activate during smoking if desired.
  • Preferably, the at least one air inlet 44 a is located adjacent the puff sensor 16, such that the puff sensor 16 senses air flow indicative of a smoker taking a puff and activates the power supply 1 and the heater activation light 48 to indicate that the heater 14 is working.
  • A control circuit is integrated with the puff sensor 16 and supplies power to the heater 14 responsive to the puff sensor 16, preferably with a maximum, time-period limiter.
  • Alternatively, the control circuitry may include a manually operable switch for a smoker to initiate a puff. The time-period of the electric current supply to the heater may be pre-set depending on the amount of liquid desired to be vaporized. The control circuitry is preferably programmable for this purpose. Alternatively, the circuitry may supply power to the heater as long as the puff sensor detects a pressure drop.
  • Preferably, when activated, the heater 14 heats a portion of the wick 28 surrounded by the heater for less than about 10 seconds, more preferably less than about 7 seconds. Thus, the power cycle (or maximum puff length) can range in period from about 2 seconds to about 10 seconds (e.g., about 3 seconds to about 9 seconds, about 4 seconds to about 8 seconds or about 5 seconds to about 7 seconds).
  • In an embodiment, the liquid supply reservoir 22 includes a liquid storage medium 21 containing liquid material. In the embodiments shown in FIGS. 1, 4, 6, 8, 9 and 13, the liquid supply reservoir 22 is contained in an outer annulus 62 between inner tube 62 and outer tube 6 and between stopper 10 and the seal 15. Thus, the liquid supply reservoir 22 at least partially surrounds the central air passage 20 and the heater 14 and the wick 14 extend between portions of the liquid supply reservoir 22. Preferably, the liquid storage material is a fibrous material comprising cotton, polyethylene, polyester, rayon and combinations thereof. Preferably, the fibers have a diameter ranging in size from about 6 microns to about 15 microns (e.g., about 8 microns to about 12 microns or about 9 microns to about 11 microns). The liquid storage medium 21 can be a sintered, porous or foamed material. Also preferably, the fibers are sized to be irrespirable and can have a cross-section which has a y shape, cross shape, clover shape or any other suitable shape. In the alternative, the reservoir 22 may comprise a filled tank lacking a fibrous storage medium 21, such as further described with reference to FIGS. 15-26.
  • Also preferably, the liquid material has a boiling point suitable for use in the electronic cigarette 60. If the boiling point is too high, the heater 14 will not be able to vaporize liquid in the wick 28. However, if the boiling point is too low, the liquid may vaporize without the heater 14 being activated.
  • The liquid material may include a tobacco-containing material including volatile tobacco flavor compounds which are released from the liquid upon heating. The liquid may also be a tobacco flavor containing material or a nicotine-containing material. Alternatively, or in addition, the liquid may include a non-tobacco material. For example, the liquid may include water, solvents, ethanol, plant extracts and natural or artificial flavors. Preferably, the liquid further includes an aerosol former. Examples of suitable aerosol formers are glycerine and propylene glycol.
  • In use, liquid material is transferred from the liquid supply reservoir 22 and/or liquid storage medium 21 in proximity of the 14 heater by capillary action in the wick 28. In one embodiment, the wick 28 has a first end portion 29 and a second opposite end portion 31 as shown in FIG. 4. The first end portion 29 and the second end portion 31 extend into opposite sides of the liquid storage medium 21 for contact with liquid material contained therein. Also preferably, the heater 14 at least partially surrounds a central portion of the wick 28 such that when the heater is activated, the liquid in the central portion of the wick 28 is vaporized by the heater 14 to vaporize the liquid material and form an aerosol.
  • One advantage of an embodiment is that the liquid material in the liquid supply reservoir 22 is protected from oxygen (because oxygen cannot generally enter the liquid storage portion via the wick) so that the risk of degradation of the liquid material is significantly reduced. Moreover, in some embodiments in which the outer tube 6 is not clear, the liquid supply reservoir 22 is protected from light so that the risk of degradation of the liquid material is significantly reduced. Thus, a high level of shelf-life and cleanliness can be maintained.
  • As shown in FIGS. 2 and 3, the mouth end insert 8, includes at least two diverging outlets 24 (e.g., 3, 4, 5 or more, preferably 2 to 10 outlets or more, more preferably 2 to 6 outlet passages 24, even more preferably 4 outlet passages 24). Preferably, the outlets 24 of the mouth end insert 8 are located at ends of off-axis passages 80 and are angled outwardly in relation to the longitudinal direction of the electronic cigarette 60 (i.e., divergently). As used herein, the term “off-axis” denotes at an angle to the longitudinal direction of the electronic cigarette. Also preferably, the mouth end insert (or flow guide) 8 includes outlets uniformly distributed around the mouth end insert 8 so as to substantially uniformly distribute aerosol in a smoker's mouth during use. Thus, as the aerosol passes into a smoker's mouth, the aerosol enters the mouth and moves in different directions so as to provide a full mouth feel as compared to electronic cigarettes having an on-axis single orifice which directs the aerosol to a single location in a smoker's mouth.
  • In addition, the outlets 24 and off-axis passages 80 are arranged such that droplets of unaerosolized liquid material carried in the aerosol impact interior surfaces 81 at mouth end insert and/or interior surfaces of the off-axis passages such that the droplets are removed or broken apart. In an embodiment, the outlets of the mouth end insert are located at the ends of the off-axis passages and are angled at 5 to 60° with respect to the central axis of the outer tube 6 so as to more completely distribute aerosol throughout a mouth of a smoker during use and to remove droplets.
  • Preferably, each outlet has a diameter of about 0.015 inch to about 0.090 inch (e.g., about 0.020 inch to about 0.040 inch or about 0.028 inch to about 0.038 inch). The size of the outlets 24 and off-axis passages 80 along with the number of outlets can be selected to adjust the resistance to draw (RTD) of the electronic cigarette 60, if desired.
  • As shown in FIG. 1, an interior surface 81 of the mouth end insert 8 can comprise a generally domed surface. Alternatively, as shown in FIG. 3, the interior surface 81′ of the mouth end insert 8 can be generally cylindrical or frustoconical, with a planar end surface. Preferably, the interior surface is substantially uniform over the surface thereof or symmetrical about the longitudinal axis of the mouth end insert 8. However, in other embodiments, the interior surface can be irregular and/or have other shapes.
  • Preferably, the mouth end insert 8 is integrally affixed within the tube 6 of the cartridge 70. Moreover, the mouth end insert 8 can be formed of a polymer selected from the group consisting of low density polyethylene, high density polyethylene, polypropylene, polyvinylchloride, polyetheretherketone (PEEK) and combinations thereof. The mouth end insert 8 may also be colored if desired.
  • In an embodiment, the electronic cigarette 60 also includes various embodiments of an air flow diverter or air flow diverter means, which are shown in FIGS. 4, 6, 8, 13, 15-26. The air flow diverter is operable to manage air flow at or about around the heater so as to abate a tendency of drawn air to cool the heater, which could otherwise lead to diminished aerosol output.
  • In one embodiment, as shown in FIGS. 4 and 5, the electronic cigarette 60 can include an air flow diverter comprising an impervious plug 30 at a downstream end 82 of the central air passage 20 in seal 15. Preferably, the central air passage 20 is an axially extending central passage in seal 15, which seals the upstream end of the annulus between the outer and inner tubes 6, 60. The air flow diverter can preferably include at least one radial air channel 32 directing air from the central passage 20 outward toward the inner tube 62 and into an outer air passage 84 defined between an outer periphery of a downstream end portion of the seal 15 and the inner wall of inner tube 62.
  • Preferably, the diameter of the bore of the central air passage 20 is substantially the same as the diameter of the at least one radial air channel 32. Also preferably, the diameter of the bore of the central air passage 20 and the at least one radial air channel 32 ranges from about 1.5 mm to about 3.5 mm (e.g., about 2.0 mm to about 3.0 mm). Optionally, the diameter of the bore of the central air passage 20 and the at least one radial air channel 32 can be adjusted to control the resistance to draw of the electronic cigarette 60. In use, the air flows into the bore of the central air passage 20, through the at least one radial air channel 32 and into the outer air passage 84 such that a lesser portion of the air flow is directed at a central portion of the heater 14 so as to minimize the aforementioned cooling effect of the airflow on the heater 14 during heating cycles. Thus, incoming air is directed away from the center of the heater 14 and the air velocity past the heater is reduced as compared to when the air flows through a central opening in the seal 15 oriented directly in line with a middle portion of the heater 14.
  • In another embodiment, as shown in FIGS. 6 and 7, the air flow diverter can be in the form of a disc 34 positioned between the downstream end of seal 15 and the heater 14. The disc 34 includes at least one orifice 36 in a transverse wall at a downstream end of an outer tubular wall 90. Also preferably, the at least one orifice 36 is off-axis so as to direct incoming air outward towards the inner wall of tube 62. During a puff, the disc 34 is operable to divert air flow away from a central portion of the heater 14 so as to counteract the tendency of the airflow to cool the heater as a result of a strong or prolonged draw by a smoker. Thus, the heater 14 is substantially prevented from cooling during heating cycles so as to prevent a drop in the amount of aerosol produced during a puff.
  • As shown in FIGS. 13 and 14, the heater 14 is oriented longitudinally within the inner tube 62 and the disc 34 includes at least one orifice 36 arranged to direct air flow non-centrally and/or radially away from the centralized location of the heater 14. In embodiment where the heater 14 is oriented longitudinally within the inner tube 62 and adjacent an inner wall of the inner tube 62, the orifices 36 can be arranged to direct at least a portion of the airflow away from the heater 14 so as to abate the cooling effect of the air flow upon the heater 14 during a power cycle and/or be arranged to decelerate the air flow to achieve the same effect.
  • In yet another embodiment, as shown in FIG. 8, the air flow diverter comprises a frustoconical section 40 extending from the downstream end 82 of a shortened central air passage 20. By shortening the central passage 20 as compared to other embodiments, the heater 14 is positioned farther away from the central passage 20 allowing the air flow to decelerate before contacting the heater 14 and lessen the tendency of the air flow to cool the heater 14. Alternatively, the heater 14 can be moved closer to the mouth end insert 8 and farther away from the central air passage 20 to allow the air flow time and/or space sufficient to decelerate to achieve the same cooling-abatement effect.
  • Preferably, the addition of the frustoconical section 40 provides a larger diameter bore size which can decelerate the air flow so that the air velocity at or about the heater 14 is reduced so as to abate the cooling effect of the air on the heater 14 during puff cycles. Preferably, the diameter of the large (exit) end of the frustoconical section 40 ranges from about 2.0 mm to about 4.0 mm, more preferably about 2.5 mm to about 3.5 mm.
  • The diameter of the bore of the central air passage 20 and the diameter of the smaller and/or larger end of the frustoconical section 40 can be adjusted to control the resistance to draw of the electronic cigarette 60.
  • Preferably, the air flow diverter of the various embodiments channels the air flow by controlling the air flow velocity (its speed and/or the direction of the air flow). For example, the air flow diverter can direct air flow in a particular direction and/or control the speed of the air flow. The air flow speed may be controlled by varying the cross sectional area of the air flow route. Air flow through a constricted section increases in speed while air flow through a wider section decreases speed.
  • In an embodiment, the electronic cigarette 60 is about the same size as a conventional cigarette. In some embodiments, the electronic cigarette 60 can be about 80 mm to about 110 mm long, preferably about 80 mm to about 100 mm long and about 7 mm to about 8 mm in diameter. For example, in an embodiment, the electronic cigarette is about 84 mm long and has a diameter of about 7.8 mm.
  • In one embodiment, the electronic cigarette 60 of FIGS. 1, 4, 6 and 8 can also include a filter segment upstream of the heater 14 and operable to restrict flow of air through the electronic cigarette 60. The addition of a filter segment can aid in adjusting the resistance to draw.
  • The outer tube 6 and/or the inner tube 62 may be formed of any suitable material or combination of materials. Examples of suitable materials include metals, alloys, plastics or composite materials containing one or more of those materials, or thermoplastics that are suitable for food or pharmaceutical applications, for example polypropylene, polyetheretherketone (PEEK), ceramic, and polyethylene. Preferably, the material is light and non-brittle.
  • As shown in FIG. 9, the electronic cigarette 60 can also include a sleeve assembly 87 removably and/or rotatably positioned about the outer tube 6 adjacent the first section 70 of the electronic cigarette 70. Moreover, the sleeve assembly 87 insulates at least a portion of the first section 70 so as to maintain the temperature of the aerosol prior to delivery to the smoker. In an embodiment, the sleeve assembly 87 is rotatable about the electronic cigarette 60 and includes spaced apart slots 88 arranged transversely about the sleeve assembly such that the slots 88 line up with the air inlets 44 in the first section 70 to allow air to pass into the electronic cigarette 60 when a smoker draws a puff. Before or during smoking, the smoker can rotate the sleeve assembly 87 such that the air inlets 44 are at least partially blocked by the sleeve assembly 87 so as to adjust the resistance to draw and/or ventilation of the electronic cigarette 60.
  • Preferably, the sleeve assembly 87 is made of silicone or other pliable material so as to provide a soft mouthfeel to the smoker. However, the sleeve assembly 87 can be formed in one or more pieces and can be formed of a variety of materials including plastics, metals and combinations thereof. In an embodiment, the sleeve assembly 87 is a single piece formed of silicone. The sleeve assembly 87 can be removed and reused with other electronic cigarettes or can be discarded along with the first section 70. The sleeve assembly 87 can be any suitable color and/or can include graphics or other indicia.
  • As shown in FIG. 10, the electronic cigarette 60 can also include an aroma strip 89 located on an outer surface 91 of at least one of the first section 70 and the second section 72. Alternatively, the aroma strip 89 can be located on a portion of the sleeve assembly 87. Preferably, the aroma strip 89 is located between the battery of the device and the heater such that the aroma strip 89 is adjacent a smoker's nose during smoking. The aroma strip 89 can include a flavor aroma gel, film or solution including a fragrance material that is released before and/or during smoking. In one embodiment, the flavor aroma of the gel, fluid and/or solution can be released by the action of a puff which may open a vent over the aroma strip when positioned inside the first section 70 (not shown). Alternatively, heat generated by the heater 14 can cause the release of the aroma.
  • In one embodiment, the aroma strip 89 can include tobacco flavor extracts. Such an extract can be obtained by grinding tobacco material to small pieces and extracting with an organic solvent for a few hours by shaking the mixture. The extract can then be filtered, dried (for example with sodium sulfate) and concentrated at controlled temperature and pressure. Alternatively, the extracts can be obtained using techniques known in the field of flavor chemistry, such as the Solvent Assisted Flavor Extraction (SAFE) distillation technique (Engel et al. 1999), which allows separation of the volatile fraction from the non-volatile fraction. Additionally, pH fractionation and chromatographic methods can be used for further separation and/or isolation of specific compounds. The intensity of the extract can be adjusted by diluting with an organic solvent or water.
  • The aroma strip 89 can be a polymeric or paper strip to which the extract can be applied, for example, using a paintbrush or by impregnation. Alternatively, the extract can be encapsulated in a paper ring and/or strip and released manually by the smoker, for example by squeezing during smoking the aroma strip 89.
  • As shown in FIGS. 11 and 12, in an alternative embodiment, the electronic cigarette of FIGS. 1, 4, 6 and 8 can includes a mouth end insert 8 having a stationary piece 27 and a rotatable piece 25. Outlets 24, 24′ are located in each of the stationary piece 27 and the rotatable piece 25. One or more of the outlets 24, 24′ align as shown to allow aerosol to enter a smoker's mouth. However, the rotatable piece 25 can be rotated within the mouth end insert 8 so as to at least partially block one or more of the outlets 24 in the stationary mouth end insert 27. Thus, the consumer can adjust the amount of aerosol drawn with each puff. The outlets 24, 24′ can be formed in the mouth end insert 8 such that the outlets 24, 24′ diverge to provide a fuller mouth feel during inhalation of the aerosol.
  • In another embodiment, the air flow diverter comprises the addition of a second wick element adjacent to but just upstream of the heater 14. The second wick element diverts portions of the air flow about the heater 14.
  • In another embodiment, as shown in FIG. 15, the electronic cigarette 60 comprises a replaceable cartridge (or first section) 70 and a reusable fixture (or second section) 72, which are coupled together at a threaded connection 205 or by other convenience such as a snug-fit, detent, clamp and/or clasp. The second section 72 can be constructed in accordance with the teachings above regarding the other embodiments such as that shown and described with respect to FIG. 1.
  • Still referring to FIG. 15, in this embodiment, the first section 70 includes an outer tube 6 (or casing) extending in a longitudinal direction and a liquid supply reservoir in the form of a truncated cylindrical tank reservoir 22 at a location between the connection 205 and a mouthpiece insert 8. Preferably, the tank reservoir 22 comprises a separately formed, self-supporting (discrete) hollow body constructed of a heat-resistant plastic or woven fiberglass. In an embodiment, the tank reservoir 22 can be generally in the form of elongate partial cylinder, one side of which is truncated. In an embodiment, the tank reservoir 22 has a transverse dimension, such as in the direction of arrow “x” in FIG. 16, and is truncated such that the aforementioned transverse dimension is approximately two-thirds of the diameter of the tank reservoir 22. The aforementioned transverse dimension may vary in other embodiments, depending on design requirements such as a desired capacity of the tank or a need for space within the casing 6 for heaters and for channeling airflow. For example, in the embodiment shown in FIG. 15, the tank reservoir 22 has a semi-circular cross-section or a transverse dimension equal to one-half the tank diameter.
  • In one embodiment, the reservoir tank 22 can be a construction separate of the casing 6 and comprises a longitudinally extending planar panel 101 and an arcuate, longitudinally extending panel 103. The arcuate panel 103 preferably conforms or mates with an interior surface 127 of the outer tube 6. It is envisioned that the tank reservoir 22 may be held in place against the interior 127 of the outer casing 6 by conveniences such as spaced ridges 333 and 333′ at predetermined locations along the interior 127 of the outer casing 6 or a rail/slide connection (e.g., see FIG. 22), a friction fit or a snap fit or other convenience. In addition or in lieu thereof, discs of liquid absorbent material 10 and 15 may be positioned against interior portions of the reservoir tank 22 to retain the reservoir tank 22 in place and also to absorb any liquid that might escape inadvertently from the tank reservoir 22 or the wick 28. The discs 10, 15 would be each provided apertures 11 to allow air and/or aerosol to pass therethrough.
  • In the preferred embodiment, a wick 28 is in communication with the interior of the supply reservoir 22 and in communication with a heater 14 such that the wick 28 draws liquid via capillary action from the reservoir tank 22 into proximity of the heater 14. The wick 28 is preferably a bundle of flexible filaments whose end portions 29 and 31 are disposed within the confines of the tank reservoir 22. Preferably, the contents of the liquid supply reservoir is a liquid as previously described together with the end portions 29, 31 of the wick 28. Preferably the end portions 29, 31 of the wick 28 occupy substantial portions of the tank interior such that orientation of the smoking article 60 does not impact the ability of the wick 28 to draw liquid. Optionally, the reservoir tank 22 may include filaments or gauze or a fibrous web to maintain distribution of liquid within the tank reservoir 22.
  • Preferably, the heater 14 may comprise a coil winding of electrically resistive wire about a portion of the wick 28. Instead or in addition, the heater may comprise a single wire, a cage of wires, printed “wire”, metallic mesh, or other arrangement instead of a coil. The heater 14 and the associated wick portion 28 may be disposed centrally of the planar panel 101 of the tank reservoir 22 as shown in FIG. 16, or could be placed at one end portion thereof or may be one or two or more heaters 14 disposed either centrally or at opposite end portions of the planar panel 101.
  • Referring now to FIGS. 15 and 16, in an embodiment, a flow diverter 100 is provided adjacent the heater 14. The diverter 100 may take the form of a generally oval shield or wall 105 extending outwardly from the plane of the planar panel 101 and proximate to the heater 14 and the wick 28 such that an approaching air stream is diverted away from the heater 14 so that the amount of air drawn directly across the heater is reduced in comparison the arrangements lacking a flow diverter 100.
  • Preferably, the oval wall 105 is open ended so that when the heater 14 is activated to freshly produce aerosol in its proximity, such supersaturated aerosol may be withdrawn from the confines of the diverter 100. Not wishing to be bound by theory, such arrangement releases aerosol by utilizing the drawing action or venturi effect of the air passing by the heater 14 and the open ended diverter 100. Optionally, holes 107 are provided in the wall 105 of the diverter 100 so that the drawing action of the air tending to withdraw aerosol from the confines of the diverter 100 does not work against a vacuum. These holes 107 may be sized to provide an optimal amount of air to be drawn into the confines of the diverter 100. Thereby, the amount of air being drawn into contact with the heater 14 is reduced and controlled, and a substantial portion of the approaching air stream is diverted and by-passes the heater 14, even during aggravated draws upon the electronic cigarette 60.
  • In addition, the holes 107 may be utilized for routing of end portions 27, 27′ of the heater 14 or separate holes or notches may be provided. In the embodiment of FIG. 16, the end portions 27, 27′ of the heater 14 and the electric leads 26 and 26′ are connected at electric contacts 111, 111′ established on the planar panel 101 adjacent the location of the diverter 100. The electrical contacts 111, 111′ may instead be established on the wall 105′ itself, as shown in FIG. 17.
  • Referring back to FIG. 16, the oval diverter shield 105 is symmetrical along the longitudinal axis such that the diverter 100 may be placed in the orientation as shown in FIG. 16 or 180° from that orientation, which facilitates manufacture and assembly of the smoking article 60.
  • Referring now to the FIG. 17, the diverter 100 may be configured instead to have an oval wall 105′ that includes an open-ended downstream portion 109, which further facilitates the release of aerosol from about the heater 14. It is envisioned that the wall 105 of the diverter 100 may take a form of a shallow “u” or “v” and may include an arched portion at least partially superposing the heater 14. In the embodiments shown in FIGS. 15, 16 and 17, the oval shield wall 105 is oriented with its longitudinal axis generally parallel to the longitudinal axis of the smoking article 60.
  • In FIGS. 18, 19 and 20 the orientation of the diverter 100 and the heater 14 may instead be transverse to the longitudinal axis of the smoking article 60. Whereas one of the former orientations may minimize disturbance of airflow, the other orientation may produce a greater number of eddies or the like to promote mixing of air with aerosol.
  • With regard to the various embodiments shown in FIGS. 15-20, it is envisioned that tank reservoir 22 may have a cap 335 at one end thereof. With the cap 335 removed, the tank reservoir 22 may be filled with liquid prior to closure with the cap 335. A friction fit or snap close arrangement may be used to keep the cap 335 in place or the cap 335 may be heat-fused into place. It is envisioned that other portions of the tank reservoir 22 structure may be used for filling. For example, the planar panel 101 may be made as a separate, attachable piece for filling operations instead of cap 335. A separate, attachable planar panel 101 is advantageous in that the diverter structure 100 may be attached to or integrally formed with the planar panel 101, before attaching the panel 101 to the remainder of the tank reservoir 22. Such arrangement also facilitates installation of the wick 28 and heater 14 within the confines of the diverter 100. It is also envisioned that the diverter 100 might be a separate piece in the form of a tub or shoe with a bottom wall having apertures for receiving end portions 29, 31 of the wick 28. Such arrangement would facilitate installation of the wick 28 and the heater 14 within the confines of separate diverter 100 for subsequent attachment to the planar wall 101.
  • Still referring now to FIGS. 15-20, when a smoker draws upon the mouthpiece portion of the electronic smoking article 60, the pressure sensor and control circuitry 16 activate the heater 14 in accordance with a power cycle such as ones previously described. Air enters the smoking article in these embodiments through the one or more ports 44, 44′ and then is drawn toward the mouthpiece 8 via the channel 110 defined between the reservoir tank 22 and opposing interior surfaces 127 of the outer casing 6. Thereafter, the aerosol produced by the heater 14 and the wick 28 is mixed with the air and the resultant aerosol (vapor) is drawn through the multi-ported mouthpiece 8.
  • With the inclusion of the diverter 100 in these embodiments, a substantial portion of the airstream entering the channel 110 bypasses the heater 14 such that a heavy drawing action on the smoking article 60 does not increase or impose a counteractive cooling effect upon the heater 14, which as previously described, may inhibit desired heater operation. Instead, the heater 14, being shielded by the diverter 100, can generate an aerosol with only a controlled or reduced amount of cooling effect from a passing air stream.
  • Referring now to FIGS. 21 and 22, in another embodiment, the reservoir tank 22 is in the form of a hollow, generally rectangular body which is insertable into the confines of the outer casing 6. In an embodiment, the top panel 122 and the bottom panel 124 can be contoured to match the curvature of the interior surfaces of the inner surface 127 of the outer tube 6 so as to provide a friction fit between the reservoir tank 22 and the outer casing 6. In another embodiment, the top panel 122 and the bottom panel 124 can each include a groove 123, 125 extending longitudinally along the length of the tank reservoir 22. In this embodiment, the grooves 123, 125 mate with rails 126, 128 extending longitudinally along the inner surface 127 of the outer casing 6 so that the reservoir tank 22 can be slid and guided into position relative to the mouthpiece insert 8. In both embodiments, the tank reservoir 22 is preferably spaced away from the mouthpiece 8 by a predetermined distance so as to provide space and opportunity for mixing of the aerosol generated at the heaters 14 a, 14 b and the airflow passing thereby. Optionally, either or both of the rails 126, 128 and the grooves 123 and 125 may be provided with detents, catches or other arrangement to lock the reservoir tank 22 into a predetermined location along the outer casing 6. The ridges 333, 333′ shown in FIG. 15 may be used instead or in addition for the placement and retention of the tank reservoir 22 of FIG. 21.
  • In an embodiment, a heater 14 a and a wick 28 a is located at a preferably central location along one side panel or panel 131 a, which is provided with a diverter 100 a in accordance with the teachings above with reference to FIGS. 15-20. Although the orientation of the heater 14 a, wick 28 a and diverter 100 a are shown to be in the longitudinal orientation, they instead could be oriented in a transverse direction and more than one of such arrangement could be disposed along the side panel 131 a. Preferably, a similar arrangement is provided on the opposite side panel 131 b such that the reservoir tank 22 feeds two wicks 28 a, 28 b or more. Although the heaters 14 a and 14 b are shown in an opposing relation, they may be offset from one-another or be located on the same side panel 131 a, 131 b. With reference also to FIG. 27, it is also envisioned that the tank reservoir 22 could be compartmentalized or partitioned such that first and second liquids are retained separately within discrete compartments 22′ and 22″ within the tank reservoir 22. In such case, the first heater 14′ and wick 28′ can be operative with a first compartment to aerosolize the first liquid; and the second heater 14″ and wick 28″ can be operative with a second compartment to aerosolize the second liquid. It is envisioned the control circuitry 16 may be programmed to operate the heaters 14′, 14″ separately, each according to parameters tailored to the requirements for aerosolizing the two (or more) separate liquid components.
  • Referring now to FIGS. 21-23, electrical connection to the heaters 14 a and 14 b may include provision of electrical contact 140, 140′ atop the tank reservoir 22, each preferably in the form of a longitudinal stripe or track extending along the a length of the top panel 122. In lieu or in addition the contacts 140, 140′ may be located along the end panels 138 and/or 138′ of the tank reservoir 22. Electrical connection from the anode and cathode of the battery 1 is effected through leads 26 that can either be biased into contact with the contact stripes 140, 140′ or be electrically connected as part of assembly of the electronic smoking article 60. Connections to heaters 14 a, 14 b may be established externally of the tank reservoir 22 by routing end portions 27, 27′ of the heater 14, 14′ through notches or holes provided in the diverter wall 105 or other convenience, such as shown in FIG. 22.
  • Referring now in particular to FIG. 23, alternatively, the end portions 27, 27′ of each heater 14 a, 14 b may be connected to the same or their own the contact stripes 140, 140′ via electrical leads 145, 146 disposed internally of the tank reservoir 22.
  • Still referring to FIG. 22, the bottom panel 124 may be a separately formed piece which snap fits or is heat sealable with the rest of the reservoir tank structure so as to facilitate assembly and to facilitate establishing electrical connections and for the filling of the tank reservoir 22. It is also envisioned that other portions of the tank 22 may be selected as the panel to serve as a separate piece. Likewise, the diverters 100 a, 100 b may be formed integrally with the side panels 131 a or 131 b or formed as a separate piece such as in the form of a tub or shoe.
  • As with the other embodiments, as air is drawn into the smoking article 60 via air inlets 44, 44′ and then along the side panels 131 a and 131 b the of the tank reservoir 22. A substantial portion of air is diverted and cause to bypass the immediate area of the heater and wick assemblies by the presence and proximity of the flow diverters 100. Aerosol formed in regions proximal of the heaters 14 a and 14 b are drawn and mixed with the airflow before being drawn through the multi-ported mouthpiece insert 8.
  • Referring now to FIGS. 24 and 25, in another embodiment, there is provided a tank reservoir 22 such as in the embodiments described with reference to FIGS. 21-23. However in this embodiment, a wick 28 has an end portion 29 which extends along the interior of the tank reservoir 22 and end portion 31 which extends in a longitudinal direction outwardly from an end panel 138 of the tank reservoir 22. The outwardly extending portion 31 of the wick 28 cooperates with a heater 14 as previously described. Optionally a cap 139 is provided at the free end of the wick 28. The end portions 27, 27′ of the heater 14 may be connected with the contact stripes 140, 140′ or other arrangements as previously described, including a direct connection with the leads 26 of the smoking article 60.
  • In this embodiment, preferably a flow diverter 100 c is disposed about both the wick portion 31 and the heater 14 and takes the form of a cylinder, which has an open downstream end portion. In operation, air is drawn along the tank reservoir 22 as aerosol is generated within the confines of the flow diverter 100 c. As the air is drawn past the flow diverter 100 c, freshly produced aerosol is drawn from the confines of the flow diverter 100 c and mixed with the air stream prior to being drawn through the mouthpiece insert 8.
  • In an embodiment, the flow diverter 100 c is provided with ports or holes 146 so as to allow some air to enter the confines of the flow diverter of 100 c so that withdrawal of freshly produced aerosol is facilitated. By such arrangement, the aerosol is withdrawn without having to work against a vacuum.
  • In another embodiment the end cap 139 may include radial extensions 139′ to promote mixing of freshly produced aerosol with the passing airstream. It is envisioned that the radial extension 139′ may be disc-like to provide collision sites to break apart and/or collect larger particles in the aerosol.
  • Whereas the embodiment shown in FIGS. 24 and 25 show a single diverter 100 c at a downstream end of the tank reservoir 22, another similar wick/heater/diverter arrangement may be constructed at the upstream end of the tank reservoir 22 in addition to the one shown in FIG. 25 (or in lieu thereof).
  • Referring now to FIG. 26, a rectangular form of tank reservoir 22 such as described with reference to FIGS. 21-23 may be partitioned by an internal panel 147 so that the upstream wick 28′ draws one liquid from one compartment 22′, and the downstream wick 28′ draws from a second compartment 22″. Such arrangement might include provision for separate connection of the heaters so that an upstream heater 14′ might heat according to different operating parameters from a downstream heater 14 to accommodate different heating requirements for formulations or components thereof.
  • Although the tank reservoir 22 of FIGS. 24-26 is shown and described as rectangular, the tank reservoir 22 can instead have other shapes, such as cylindrical body that is undersized with respect to the interior of the outer casing 6 so as to permit airflow to pass thereby.
  • The above teachings provide examples of an electronic smoking article 60 being modified to include the air flow diverter, all which change the speed and/or direction of the airstream to counteract the tendency of the airstream to cool the heater 14.
  • The teachings herein are applicable to electronic cigars, and references to “electronic cigarette(s)” is intended to be inclusive of electronic cigars and the like. Moreover, references to “electronic smoking articles” is intended to be inclusive of electronic cigars, electronic cigarettes and the like.
  • When the word “about” is used in this specification in connection with a numerical value, it is intended that the associated numerical value include a tolerance of ±10% around the stated numerical value. Moreover, when reference is made to percentages in this specification, it is intended that those percentages are based on weight, i.e., weight percentages.
  • Moreover, when the words “generally” and “substantially” are used in connection with geometric shapes, it is intended that precision of the geometric shape is not required but that latitude for the shape is within the scope of the disclosure. When used with geometric terms, the words “generally” and “substantially” are intended to encompass not only features which meet the strict definitions but also features which fairly approximate the strict definitions.
  • It will now be apparent that a new, improved, and nonobvious electronic cigarette has been described in this specification with sufficient particularity as to be understood by one of ordinary skill in the art. Moreover, it will be apparent to those skilled in the art that modifications, variations, substitutions, and equivalents exist for features of the electronic cigarette which do not materially depart from the spirit and scope of the invention. Accordingly, it is expressly intended that all such modifications, variations, substitutions, and equivalents which fall within the spirit and scope of the invention as defined by the appended claims shall be embraced by the appended claims.

Claims (58)

We claim:
1. An electronic cigarette having a heater which vaporizes liquid material to produce an aerosol, a mouth end insert including at least two diverging outlets which are located at the end of off-axis passages, and an air flow diverter operable to prevent incoming air from reducing aerosol output due to cooling of the heater during puff cycles.
2. The electronic cigarette of claim 1, further comprising:
an outer cylindrical tube extending in a longitudinal direction;
an inner cylindrical tube within the outer cylindrical tube;
a central air passage in communication with an upstream end of the inner cylindrical tube;
a liquid supply comprising a liquid material, the liquid supply contained in an outer annulus between the outer cylindrical tube and the inner cylindrical tube;
the heater located in the inner cylindrical tube downstream of and in spaced apart relation to the central air passage;
a wick in communication with the liquid supply and in communication with the heater such that the wick delivers liquid material to the heater and the heater heats the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol in the inner cylindrical tube;
a power supply operable to apply voltage across the heater; and
at least one air inlet operable to deliver air drawn into the central passage by a puff on the electronic cigarette.
3. The electronic cigarette of claim 1, wherein the mouth end insert is in fluid communication with the central air passage via the inner cylindrical tube.
4. The electronic cigarette of claim 2, wherein the heater is a wire coil comprising at least one material selected from the group consisting of stainless steel, copper, copper alloys, nickel-chromium alloys, iron aluminum alloys, iron chromium alloys, superalloys, iron aluminides, nickel aluminides and combinations thereof.
5. The electronic cigarette of claim 2, wherein the wick comprises one or more filaments.
6. The electronic cigarette of claim 2, wherein the power supply includes a battery.
7. The electronic cigarette of claim 6, wherein the heater is connected to the battery by two spaced apart electrical leads.
8. The electronic cigarette of claim 2, further including control circuitry including a puff sensor, the puff sensor operable to sense air flow and initiate application of voltage from the power supply to the heater.
9. The electronic cigarette of claim 8, wherein the at least one air inlet is located adjacent the puff sensor and/or adjacent the central air passage.
10. The electronic cigarette of claim 8, wherein the control circuitry further includes a heater activation light at an upstream end of the electronic cigarette, the heater activation light operable to light up when the heater is activated.
11. The electronic cigarette of claim 2, wherein the liquid supply further includes a liquid storage medium operable to store the liquid material, the liquid storage medium comprises a material selected from the group consisting of rayon, polyester, polyethylene, cotton, ceramic, polyetheretherketone (PEEK) and combinations thereof.
12. The electronic cigarette of claim 2, wherein the electronic cigarette comprises a first section attachable to a second section and wherein the wick, the liquid supply and the mouth end insert are contained in the first section and the power supply is contained in a second section.
13. The electronic cigarette of claim 12, wherein the first section and the second section have the same outer diameter and wherein first section is a disposable downstream section and the second section is a reusable upstream section.
14. The electronic cigarette of claim 1, wherein the air flow diverter is operable to divert at least some air flow away from a portion of the heater.
15. The electronic cigarette of claim 14, wherein the air flow diverter comprises an impervious plug at a downstream end of the central air passage and at least one radial air channel extending from an upstream end of the central air passage to an outer longitudinal air passage which at least partially surrounds the downstream end of the central air passage, the air flow diverter operable to direct air flow away from a portion of the heater.
16. The electronic cigarette of claim 15, wherein the at least one radial air channel has about the same diameter as the central air passage.
17. The electronic cigarette of claim 14, wherein the air flow diverter comprises a disc having at least one orifice therein, the disc being operable to divert air flow away from a portion of the heater so as to decrease the variability in heater temperature as a result of the strength of draw by a smoker.
18. The electronic cigarette of claim 17, wherein the disc includes an outer tubular wall and the at least one orifice extends at an angle to the longitudinal direction.
19. The electronic cigarette of claim 17, wherein the disc is formed of a material selected from the group consisting of plastic, paperboard, polymers, foamed paper and combinations thereof.
20. The electronic cigarette of claim 14, wherein the air flow diverter comprises a frustoconical section adjacent a downstream end of the central air passage, the frustoconical section operable to direct air flow away from a portion of the heater.
21. The electronic cigarette of claim 2, further including a filter segment upstream of the heater operable to restrict flow of air through the electronic cigarette and adjust the resistance to draw thereof.
22. The electronic cigarette of claim 2, wherein the at least two diverging outlets of the mouth end insert are angled at about 5° to about 60° in relation to the longitudinal direction of the electronic cigarette such that droplets carried in the aerosol strike sides of the off-axis passages.
23. An electronic cigarette comprising:
an outer casing extending in a longitudinal direction;
a tank reservoir at a location along an interior of said outer casing, said tank reservoir comprising a discrete, hollow body containing a liquid;
a heater adjacent said tank reservoir which vaporizes liquid supplied to said heater from said tank reservoir to produce an aerosol; and
an air flow diverter comprising a diverter wall at least partially disposed about said heater, said diverter wall and said heater at a location along said tank reservoir.
24. The electronic cigarette of claim 23, further comprising:
a wick in communication with the tank reservoir and in communication with the heater such that the wick delivers liquid material to the heater and the heater heats the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol; and
a power supply operable to apply voltage across the heater.
25. The electronic cigarette of claim 23, wherein the outer casing is at least partially transparent or includes a transparent window superposed with the liquid supply reservoir.
26. The electronic cigarette of claim 23, wherein the heater comprises a coil which extends in the longitudinal direction and said diverter comprises a cylinder coaxially disposed about said heater.
27. The electronic cigarette of claim 26, wherein said diverter further comprises a cylinder portion having an orifice, whereby release of aerosol is facilitated.
28. The electronic cigarette of claim 23, wherein the diverter wall includes a hole to facilitate release of aerosol.
29. The electronic cigarette of claim 23, wherein the diverter wall is oriented transversely relative to said casing.
30. The electronic cigarette of claim 23, wherein the diverter wall is oriented longitudinally relative to said casing.
31. The electronic cigarette of claim 23, wherein:
said heater comprises first and second heaters at a first and a second location along said tank reservoir, and said diverter comprises first and second diverters at said first and second locations.
32. The electronic cigarette of claim 31, wherein said first and second locations are on opposite sides of said tank reservoir.
33. The electronic cigarette of claim 31, wherein said first and second locations are mutually spaced apart longitudinally, said tank reservoir being partitioned into a first upstream compartment and a second downstream compartment, said first heater communicating with said first compartment, said second heater communicating with said second compartment.
34. The electronic cigarette of claim 24, wherein said heater is connected to said power supply by an electrical connection established at an electrical contact at a location along said diverter wall.
35. The electronic cigarette of claim 24, wherein said heater is connected to said power supply by an electrical connection established at an electrical contact at a location along a panel of said tank reservoir.
36. The electronic cigarette of claim 23, wherein said tank reservoir body is rectangular and comprising top and bottom panels configured to mate with an interior surface of said outer casing.
37. The electronic cigarette of claim 36, wherein said top and bottom panels and said interior surface mate with a groove and a guide.
38. The electronic cigarette of claim 23, wherein said tank reservoir body has a truncated cylindrical shape and comprising an arcuate panel configured to conform with an interior surface of said outer casing.
39. The electronic cigarette of claim 24, wherein said heater, said wick and said diverter wall are assembled as a unit, said unit attached to a panel of said tank reservoir.
40. The electronic cigarette of claim 23, wherein said wall includes an opening for release of aerosol, said wall further including a hole to facilitate said release of aerosol.
41. The electronic cigarette of claim 23, wherein the airflow diverter comprises a first diverter wall extending substantially perpendicular from a first longitudinally extending wall of the liquid supply reservoir, the first diverter wall extending least partially around a perimeter of the first heater and being sized and configured to at least partially shield the first heater from airflow and to at least partially divert airflow around the first heater during use.
42. The electronic cigarette of claim 41, wherein the airflow diverter comprises a second diverter wall extending substantially perpendicular from a second longitudinally extending wall of the liquid supply reservoir, the second diverter wall extending at least partially around a perimeter of the second heater and being sized and configured to at least partially shield the second heater from airflow and to at least partially divert airflow around the second heater during use.
43. The electronic cigarette of claim 23, wherein the tank reservoir includes a top panel, a bottom panel, a first side panel and a second side panel and wherein the top panel includes a first groove and the bottom panel includes a second groove, the first groove and the second groove operable to mate with a first protrusion and a second protrusion extending from an inner surface of the outer casing so as to secure the liquid supply reservoir within the casing.
44. The electronic cigarette of claim 23, wherein the first diverter wall is formed of plastic, metal or fiberglass.
45. The electronic cigarette of claim 42, wherein the first heater and the second heater comprise heater coils which extend in the longitudinal direction.
46. The electronic cigarette of claim 42, wherein the first heater and the second heater comprise heater coils which extend transverse to the longitudinal direction.
47. The electronic cigarette of claim 1, further including an adjustable sleeve assembly operable to adjust the amount of ventilation entering the electronic cigarette during each puff and to provide a softer mouth feel, the adjustable sleeve surrounding a portion of the outer tube adjacent a mouth end thereof.
48. The electronic cigarette of claim 1, further including at least one aroma strip operable to release aromas before and during smoking.
49. The electronic cigarette of claim 1, wherein the mouth end insert comprises a stationary piece and a rotatable piece, each of the stationary piece and the rotatable piece having outlets therein.
50. An electronic cigarette having a heater which vaporizes liquid material to produce an aerosol and an air flow diverter means for preventing incoming air from reducing aerosol output due to cooling of the heater during puff cycles.
51. The electronic cigarette of claim 50, further comprising:
an outer cylindrical tube extending in a longitudinal direction;
an inner cylindrical tube within the outer cylindrical tube a central air passage in communication with an upstream end of the inner cylindrical tube;
a liquid supply comprising a liquid material, the liquid supply contained in an outer annulus between the outer cylindrical tube and the inner cylindrical tube;
the heater located in the inner cylindrical tube downstream of and in spaced apart relation to the central air passage;
a wick in communication with the liquid supply and in communication with the heater such that the wick delivers liquid material to the heater and the heater heats the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol in the inner cylindrical tube;
a power supply operable to apply voltage across the heater;
at least one air inlet operable to deliver air drawn into the central passage by a puff on the electronic cigarette; and
a mouthpiece having at least two outlets, wherein the mouthpiece is in fluid communication with the central air passage via the inner cylindrical tube.
52. The electronic cigarette of claim 50, wherein the air flow diverter means is operable to divert at least some air flow away from a portion of the heater.
53. The electronic cigarette of claim 52, wherein the air flow diverter means comprises an impervious plug at a downstream end of the central air passage and at least one radial air channel extending from an upstream end of the central air passage to an outer longitudinal air passage which at least partially surrounds the downstream end of the central air passage, the air diverter element operable to direct air flow away from a portion of the heater.
54. The electronic cigarette of claim 53, wherein the at least one radial air channel has about the same diameter as the central air passage.
55. The electronic cigarette of claim 52, wherein the air flow diverter means comprises a disc having at least one orifice therein, the disc being operable to divert air flow away from a portion of the heater so as to decrease the variability in heater temperature as a result of the strength of draw by a smoker.
56. The electronic cigarette of claim 55, wherein the disc includes an outer tubular wall and the at least one orifice extends at an angle to the longitudinal direction.
57. The electronic cigarette of claim 55, wherein the disc is formed of a material selected from the group consisting of plastic, paperboard, polymers, foamed paper and combinations thereof.
58. The electronic cigarette of claim 52, wherein the air flow diverter means comprises a frustoconical section adjacent a downstream end of the central air passage, the frustoconical section operable to direct air flow away from a portion of the heater.
US13/756,127 2012-01-31 2013-01-31 Electronic cigarette Active 2034-02-16 US9510623B2 (en)

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US15/065,422 US10092037B2 (en) 2012-01-31 2016-03-09 Electronic cigarette
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US16/106,049 US20180352866A1 (en) 2012-01-31 2018-08-21 Electronic cigarette

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US14/991,449 Active US9474306B2 (en) 2012-01-31 2016-01-08 Electronic cigarette
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